A169939 - OEIS

A169939 as a simple table

n	a(n)
1	0
2	1
3	3
4	10
5	11
6	13
7	30
8	31
9	100
10	101
11	103
12	110
13	111
14	113
15	130
16	300
17	301
18	310
19	311
20	1000
21	1001
22	1003
23	1010
24	1011
25	1013
26	1030
27	1031
28	1100
29	1101
30	1103
31	1110
32	1111
33	1113
34	1130
35	1300
36	1301
37	3000
38	3001
39	3010
40	3011
41	3100
42	3101
43	3110
44	3111
45	10000
46	10001
47	10003
48	10010

[0,1,3,10,11,13,30,31,100,101,103,110,111,113,130, 300,301,310,311,1000,1001,1003,1010,1011,1013, 1030,1031,1100,1101,1103,1110,1111,1113,1130,1300, 1301,3000,3001,3010,3011,3100,3101,3110,3111, 10000,10001,10003,10010]